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radiator problem... water pressure..


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hi guys,

the problem is when i get on to the motorway and drive about 70-80.. when i get to destination and open the bonnet, theres water/coolant all over the place..

the radiator is forcing water in to overflow and then thats spraying all over the bay?

the temp gauge stays near middle of gauge.

what could be problem?

thanks guys

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I've checked the car over today and done afew things..

both rad pipes are hot

no oil / water mix

heater blowing hot

temp gauge needle stays in middle

rad fan works too

changed the rad cap too...

whats the easiest way to empty overflow tank?

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ok guys, went out this morning before work and took rad cap off and the radiator was full and so was overflow tank.. so i started the car up and the coolant started to rise and come out of rad, so i closed the rad with cap, emptied the overflow to just about low and then went for a drive...

when i came back the overflow tank was full. left it there for about an hour and it was still same...

phoned the place that did the conversion and they suggested i do the same thing and empty the overflow tank, fill the rad up and go for another drive but dont boost it and i did that... went on to the motorway with no booost (which is 0.1 bar) and did that for about 20mins.. i came back and the coolant hadnt moved... it was the same as just before i left..

so on boost its forcing water out and on no boost its fine?

any suggestions?

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no luck luke, changed it with one that i know for a fact is literally brand new..

havent had any luck with either test...

went to atleast 9 garages.. all busy. but when i explained what was happening i got some different reactions...

afew said headgasket (early),

afew said thermostat and waterpump because its not doing it all the time and only doing it on boost,

and one said blockage somewhere..

one also said when you rev engine and hold top radiator hose, there was alot of pressure building up...

most of them said come back tomorow, so another night of thinking and worry... :scratch: :oops:

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the head will lift when your on boost, what mine was doing...

another thing to do is mate, drive on boost hard, stop somewhere, pop the expansion tank and have the nozzle still inside the coolant, and then rev the car (on the throttlebody) untill you hear the dump valve loud (meaning rev it hard) and see if any bubbles are coming through the expansion.

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well i went out today and its fine now..

dunno what was wrong with it... seems to have sorted it itself..

this is what did to check if it was rising..

when car was warm..

DSCN4725.jpg

on and off boost (stayed the same)

DSCN4727.jpg

just hard booost

DSCN4733.jpg

left it to cool down, came back after 2 hours and it had gone down to just below the red line

very strange

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